Capacitance detection circuit and capacitance detection method

A capacitance detection circuit in which detection wirings are arranged in such a manner as to intersect a plurality of driving wirings, detection electrodes forming capacitances between the driving wirings and the detection wirings that intersect each other are formed within a sensor plane, and a capacitance change of the detection electrode, which changes due to a piece to be detected, is detected as a voltage value, the capacitance detection circuit comprising:

• column wiring driving means for driving the driving wirings;
• detection wiring selection means for selecting predetermined detection wiring from among a plurality of detection wirings;
• a reference electrode arranged in the vicinity of the detection electrode, the reference electrode detecting the electrical potential of the piece to be detected as a reference potential;
• and
• a capacitance computation section for determining a voltage value corresponding to the capacitance change on the basis of the reference potential and the detection potential determined from the electrical current corresponding to the capacitance of the detection electrode.